1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
# A small example on how to make parslet ignore parts of the parse tree.
$:.unshift File.dirname(__FILE__) + "/../lib"
require 'parslet'
class IgnoreParslet < Parslet::Atoms::Base
def initialize(parslet)
@parslet = parslet
end
def to_s_inner(prec)
@parslet.to_s(prec)
end
def try(source, context, consume_all)
success, value = result = @parslet.try(source, context, consume_all)
return succ(nil) if success
return result
end
end
module IgnoreDSL
def ignore
IgnoreParslet.new(self)
end
end
class Parslet::Atoms::Base
include IgnoreDSL
end
include Parslet
p (str('a') >> str('b').ignore >> str('c')).
parse('abc')
|
